Method of making cores of sand.



. No Drawing.

UNITED STATES PA. TENT OFFICE.

GEORGE W. LEWIS, OF SCRANTON, PENNSYLVANIA, ASSIGNGR TO SAMUEL H. IBAIRD, OF NEW YORK, N. Y.

I METHOD OF MAKING CORES OF SAND.

Specification of Letters Patent.

Application filed February 17, 1910.

Patented June "4, 1910u Serial No. 544,364,

To all whom it may concern:

Be it known that I, Gnonon "s r. LEWIS, a citizen of the United States, residing lIl Scranton, in the county of Lackawanna and State of Pennsylvania, with post-oltice address at Heranton, have invented certain new and useful improvements in Methods thereby decreasing the cost of the cores.

In the making of cores, as now carried on, so far as I am aware, the practice is to mix simultaneously in one operation the necessary amount of sand, the required quantity of oil and a certain percentage of water. After the. mixing is completed in any suitable mixer, the mixture of sand, water and oil is pressed into shape and then baked to give 1e core the required degree of hardness. \i'hen cores are made in this way the qua itity of oil required is relatively large an -l, as the oil is the most expensive of the naterials used in making cores, it is a deside atum of importance to reduce the quantity of oil as much as possible.

The improved method of making cores which constitutesthe preseut invention, consists in, first), mixing the oil and water very intimately so as to form an emulsion; then mixing the emulsion so formed with the sand; and, finally, forming the core and baking it in the usual manner. I have found by experiment that the quantity of oil required by this method is much smaller than by the old method. The proportions of oil and water employed in the improved method will ordinarily range from titty per cent. of oil and fifty per tent. of Water to twenty per cent. of oil and eighty per cent. of water: but proportions outside of this range may also he Found to giro satisfactory results.

In mixing the oil and water for making cores according to this invention, any suit able form of mixing apparatus may be employed, and the oil used is the same as that employed in the making of cores by the methods now in use.

lllaving thus described my invention, what; I claim as new and desire to secure by Letters Patent is:

1. The improved method of making cores which consists in, first, mixing intimately so as to form an emulsion a. suitable quantity of oil and water, then mixing the emulsion so formed with sand, next forming the mix ture into a core and, finally, baking the core so formed.

2. The method of making cores for molding metals which consists in, first, forming an emulsion of oil and Water comprisin from fifty to eighty per cent. by volume of water, intimately mixing the emulsion with sand, shapingeores oi the mixture and, finally, baking the cores so formed.

In testimony whereof, I have signed my name hereto in the presence of witnesses GEORGE .V. LEWIS.

\Vitnesses:

H. D. MLLLAR, WM. C. BURG. 

